Mazda 323

since 1985 of release

Repair and car operation

Principle of operation of the catalytic converter (catalyst)

The petrol MAZDA 323 models can be equipped with the adjustable or noncontrollable catalyst. The adjustable catalyst demands existence of an adjustable smeseobrazovatel.

The adjustable smeseobrazovatel is understood as the carburetor or injection system at which the relation of fuel to air can constantly change depending on an operating mode and from the content of oxygen in the fulfilled gases. With the former carburetor it is impossible, as it has no corresponding monitor. Therefore it is applied or elektronno the adjustable carburetor, or system of injection of fuel.

The smeseobrazovatel receives management signals from a lambda probe which is in a forward part of system and is blown by a stream of exhaust gases. The lambda probe is an electric sensor which displays the residual content of oxygen in exhaust gases in the form of electric fluctuations and allows to draw a conclusion on structure of a toplivovozdushny mix. In fractions of a second the lambda probe can give the corresponding signal on an element of management of a smeseobrazovatel thanks to what the optimum relation of fuel and air can be supported. It on the one hand is necessary, as operating modes (the idling, full gas), on the other hand, constantly change because reburning in the catalyst can occur only if in exhaust gases there is a sufficient part of gasoline. T. the lake that in the catalyst at temperature +300 ° — +800°С in general could occur reburning, it is necessary, that the toplivovozdushny mix had more fuel than at pure combustion.

The three-functional catalyst is everywhere applied. It means that at such catalyst on a basis the lambda of adjustment is at the same time carried out oxidation of an oxide of carbon (WITH) and hydrocarbon (NANOSECOND), and also decrease in an oxide of nitrogen _(N0x)